TY - JOUR A1 - Umezawa, T. A1 - Sugawara, S. A1 - Kawamura, K. A1 - Oyabu, I. A1 - Andrews, S. J. A1 - Saito, T. A1 - Aoki, S. A1 - Nakazawa, T. T1 - Towards reconstructing the Arctic atmospheric methane history over the 20th century: measurement and modeling results for the NGRIP firn JO - Atmos. Chem. Phys. Discuss. J1 - ACPD VL - 2021 SP - 1 EP - 24 Y1 - 2021/08/31 PB - Copernicus Publications SN - 1680-7375 UR - https://acp.copernicus.org/preprints/acp-2021-736/ L1 - https://acp.copernicus.org/preprints/acp-2021-736/acp-2021-736.pdf DO - 10.5194/acp-2021-736 ER -